Two heuristics based on branch and bound (B&B) are developed to solve closed-loop material requirements planning (MRP) lot-sizing problems that have general product structures and variable costs. A “look ahead method'’(LAM) heuristic allows for variable production/purchasing costs and uses a...

The research on lot sizing is extensive; however, no author in the literature reviewed to date provides an optimal solution algorithm to a prevalent problem which is found in manufacturing. A multi-level, general product-structure, variable-cost model is presented which follows the procedure of a...

In the economics of joint production one often distinguishes between the two cases: the one in which a firm produces multiple products each produced under separate production process, and the other "true joint production" where a number of outputs are produced from a single production process,...

A bicriteria traveling salesman problem with sequence priorities / Heinz Schmitz and Sebastian Niemann -- Metaheuristics for tourist trip planning / Pieter Vansteenwegen [and others] -- Solving fuzzy multi-item economic order quantity problems via fuzzy ranking functions and particle swarm...